The assembly of massive galaxies from NIR observations of the Hubble Deep Field South

Details The assembly of massive galaxies from NIR observations of the Hubble Deep Field South The assembly of massive galaxies from NIR observations of the Hubble Deep Field South

2003-07-17

arxiv.org/abs/astro-ph/0307332v1

Astrophys.J.594:L9-L12,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication on ApJLetters

Scientific paper

10.1086/378489

We use a deep K(AB)<25 galaxy sample in the Hubble Deep Field South to trace the evolution of the cosmological stellar mass density from z~ 0.5 to z~3. We find clear evidence for a decrease of the average stellar mass density at high redshift, 22 is 20^{+20}_{-5} % of the local value. In the mass--limited subsample at z>2, the fraction of passively fading galaxies is at most 25%, although they can contribute up to about 40% of the stellar mass density. On the other hand, star--forming galaxies at z>2 form stars with an average specific rate at least <\dot M/M_*> ~4 x10^{-10} yr$^{-1}$, 3 times higher than the z<~1 value. This implies that UV bright star--forming galaxies are substancial contributors to the rise of the stellar mass density with cosmic time. Although these results are globally consistent with $\Lambda$--CDM scenarios, the present rendition of semi analytic models fails to match the stellar mass density produced by more massive galaxies present at z>2.

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